Telephony.



No. 893,250. PATENTED 1111314, 190 8 I. KITSEE. TELEPHONY.

APPLICATION FILED AUG. 27, 1907- WITNESSES.-

IN VEN TOR.

UNITED STATES PATENT OFFICE.

ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONY.

.-.wherein two circuits center in different exchanges and are connected together through a trunk line.

The drawing represents in diagrammatic view a trunk line and means to connect thereto two telephonic circuits.

In this drawing, A and B are the two terminal stations of the trunk line.

1 is the trunk line proper; 2 and 3 the sources of current, here shown as batteries; 4 the repeating or induction device as an entlirety, of whlch 5 and 6 are the separate e01 s.

8 and 9 are shunt wires around the batteries 2-and 3 respectively.

11 and 12 are jacks adapted to receive the lug 13. Of this plug, 14 and 15 are the con uctors supposedly connected to a local tele honic circuit.

Vahen the line is idle, no current will flow in the trunk circuit, as the batteries 2 and 3 are oppositely connected and are sup osed to be of equal electro-motive force. sVhen now the operator,say at A,inserts the plug 13 in the jacks 11 or 12, thereby connecting his circuit through 14 and 15, the

shunt consisting of the wires 8 and 9 is closed through the connected local telephonic circuit and the current from the attery 2 will now-flow through the shunt, the jacks, plug, and the local telephonic circuit. Through the manipulation of the micro-phonic transmitterin the local circuit, the current of the battery 2 will be varied, and through said variation, impulses will be induced in 6. These impulses will flow over the trunk line and will be received at the station B in the same manner as induced impulses are received to-day with the aid of an inductorium or repeating device.

As in some cases, it is necessary for the operator to know the status of the trunk line, I have provided this line with the device 7 comprising an electro-magnet inserted in the trunk, and a local circuit containingan annunciating device, such as a lamp, in

Specification of Letters Patent.

Application filed August 27, 1907. Serial No. 390,308.

Patented July 14, 1908.

operative relation thereto, so that this lamp may light when one or the other of the stations inserts the plug in the jack. In such systems where a trunk line is used by operators of different switch boards, it may also be necessary for the operators to know the status of the shunt circuit, that is, if the trunk is used locally or not and for this reason, I have provided the shunt with the device 10, this device being about a duplicate of the device 7.

It is unnecessary for me to state the location of the different devices, as in different systems they may vary. It suffices to say that with this system, the simple manipulation of the insertion of a plug will be sufficient to connect two subscribers of different exchanges or located in different cities.

The arrangement-described may be practiced with any of the well known systems, but its great value is apparent in such systems where the common battery, usually connected to subscribers lines, is cut off from said lines when the connection between two subscribers is made through a trunk line.

Having now described my invention, what 'I claim as new and desire to secure by Letters Patent is 1. In tele hony, a trunk line, closed at bothtermina s through sources of current, the sources connected in opposition as to each other, jacks at each terminal and two annunciating means at each terminal for said line; one of said annunciating means adapted to be operated through the insertion of the plug in the home-jack and the second of said annunciating means ada ted to be operated through the insertion o the plug in the jack of the far off terminal.

2. In telephony, a trunk line normally connected at each terminal through sources of current, both sources in opposition as to each other, two annunciating means for each terminal, jack for each terminal, and means operatively related to said jack to operate one of said annunciating means at the home terminal through the insertion of a plug in the home jack simultaneously with the operation of the second annunciating means at the far ofl terminal through the insertion of said lug. 3. In telephony, a trunk line, two annunciating devices for each terminal of said line, and means at each terminal to make operative, through the insertion of a plug in the home jacks, one of said annunciating means at the home terminal and the second of said annunciating means at the far off terminal, and means for each terminal to make inoperative one of said annunciating means at each terminal and make operative the other of said annunciating means at each terminal through the insertion of a plug in the jacks of both terminals 4. In a telephonic system wherein two telephonic circuits center each in a separate eX- change, means to connect said circuits, said means comprising a trunk line normally closed through opposing batteries, a shunt around each of said batteries, jacks connected to said shunt and a plug for each of the telephonic circuits.

5. In a telephonic system wherein two telephonic circuits center each in a separate exchange, means to connect said circuits, said means comprising a trunk line normally closed through opposing batteries, a shunt around each of said batteries, jacks connected to said shunt, a plug for each of the telephonic circuits and a repeating device, one

coil connected in the shunt, the second coil connected in the trunk line.

6. In a telephonic system wherein two telephonic circuits center each in a separate eX- change, means to connect said circuits, said means comprising a trunk line normally closed through opposing batteries, a shunt around each of said batteries, jacks connected to said shunt, a plug for each of the telephonic circuits and a repeating device, one 1 around each of said batteries, jacks connect- 1 ed to said shunt, a plug for each of the telc phonic circuits and a repeating device, one coil connected in the shunt, the second coil connected in the trunk line and amiunciating device operatively related to the shunt circuit.

8. In telephony, a trunk line normally connected to sources of current in opposition as to each other, jacks for each terminal, means for said trunk line to annunciate at one terminal that the operator at the second terminal is calling, and means for both terminals to annunciate to both operators that the line is busy, said means embracing two annunciating means for each of said terminals.

In testimony whereof I al'fix my signature in presence of two witnesses.

ISIDOR KITSEE. Witnesses:

EDITH R. STILLEY, MARY C. SMITH. 

